1、BRITISH STANDARD BS 5550-5.4.1: 1986 Cinematography Part 5: Common to more than one gauge Section 5.4 Sound Subsection 5.4.1 Code of practice for the identification of systems for synchronization of unperforated audio tape with motion-picture film and videotape UDC 778.534.425:778.534.48BS5550-5.4.1
2、:1986 This British Standard, having been prepared under the directionof the Cinematography and Photography Standards Committee, was published underthe authority of the BoardofBSI and comes into effecton 31December1986 BSI 10-1999 First published October 1978 First revision December 1986 The followin
3、g BSI references relate to the work on this standard: Committee reference CPM/5 Draft for comment 85/35608 DC ISBN 0 580 15545 5 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Cinematography and Photography Standards Committee (CPM/-) t
4、o Technical Committee CPM/5, upon which the following bodies were represented: Association of Cinematograph, Television and Allied Technicians Association of Independent Cinemas British Broadcasting Corporation British Film and Television Producers Association British Film Institute British Kinemato
5、graph, Sound and Television Society Cinematograph Exhibitors Association of Great Britain and Ireland Independent Television Companies Association Institute of Amateur Cinematographers Royal Photographic Society Amendments issued since publication Amd. No. Date of issue CommentsBS5550-5.4.1:1986 BSI
6、 10-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Characteristics of synchronization systems 1 Table 1 Synchronization systems 2 Publication referred to Inside back coverBS5550-5.4.1:1986 ii BSI 10-1999 Foreword This revision of BS5550-5.4.1 has been prepared
7、 under the direction of the Cinematographic and Photographic Standards Committee. The standard has been revised to include all current systems of pulse and time code synchronization as used in the film and television industries. It supersedes BS5550-5.4.1:1978 which is withdrawn. A British Standard
8、does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an i
9、nside front cover, pagesi andii, pages1 and2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS5550-5.4.1:1986 BSI 10-1999 1 1 Scope This Subs
10、ection of BS5550 identifies the various systems of pulse and time code synchronization for unperforated magnetic audio tape as specified in BS6288-1, currently used in conjunction with motion-picture and videotape recordings. NOTEThe title of the publication referred to in this standard is given on
11、the inside back cover. 2 Characteristics of synchronization systems 2.1 The dimensional features of synchronization systems likely to be encountered are shown in Table 1. 2.2 Both the time base frequency and a description of the synchronizing signal should be stated, together with a reference to the
12、 picture frame rate frequency (in frames per second) (e.g.50Hz Neo Pilotton referred to25 frames per second). 2.3 If integrated audio and time code heads with in-line gaps cannot be used for crosstalk reasons and separate code heads have to be used, the resulting time difference on tape between the
13、audio and the time code recordings should be compensated electronically within the recorder itself. Any off-set in time between the audio and the time code recordings should be stated on the spool or container. 2.4 The recommended speed for6.25mm tape is19.05cm/s, although38.1cm/s is acceptable. The
14、 recommended speed for3.81mm tape is9.52cm/s, although other speeds may also be used. 2.5 The recording should be made in such a manner that, on reproduction, the tape moves from left to right with the magnetic coating away from the observer. The positions of the audio records and the pulse and time
15、 code records are given inTable 1. 2.6 In multitrack records the synchronizing signal should be located on the higher track number.BS5550-5.4.1:1986 2 BSI 10-1999 Table 1 Synchronization systems System Diagrammatic representation of the system Sync. signal data Telefunken (stereo) 10 kHz carrier FM
16、by 50 Hz or60 Hz NAGRA SN 10 Hz or 25 Hz or 30 Hz from crystal generator NAGRA (stereo) 13.5 kHz carrier FM by 50 Hz or60 Hz Synchrotone 50 Hz or 60 Hz Neo Pilotton 50 Hz or 60 Hz push-pull EBU format SMPTE/EBU timecode NAB format SMPTE/EBU timecode Key 1. Audio heads indicated thus 2. Synchronizing
17、 heads indicated thus All dimensions are in millimetres.BS5550-5.4.1:1986 BSI 10-1999 Publication referred to BS 6288, Magnetic tape sound recording and reproducing systems. BS 6288-1, Specification for general conditions and requirements. BS 5550-5.4.1: 1986 BSI 389 Chiswick High Road London W4 4AL
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